The Firing Line Forums - View Single Post

mikthestick · March 12, 2012, 11:34 AM

Don't Know how to put up a profile of my own so:.I am a retied Electrical/electronic engineer. More importantly I am a Brit and don't own guns although I'm very interested. I wanted the formula so I could do in my head what you can do in practice (with your chrono). Somewhere on this sight I found a link to a site which calculates Muzzle velocity but needed "a published load", case capacities, lengths etc, and gave no formulas. When I tried to use it with what Info I had it seemed very inaccurate. It gave a velocity which was supposed to be 65% of the shots. The string deviation was always about 50ft/sec or more above and below the 65% value. I always thought published figures were about average for a string, perhaps plus or minus 25-30ft/sec.

March 12, 2012, 11:34 AM	#7
mikthestick Senior Member Join Date: January 29, 2012 Location: Devon England Posts: 177	Looked at your profile Don't Know how to put up a profile of my own so:.I am a retied Electrical/electronic engineer. More importantly I am a Brit and don't own guns although I'm very interested. I wanted the formula so I could do in my head what you can do in practice (with your chrono). Somewhere on this sight I found a link to a site which calculates Muzzle velocity but needed "a published load", case capacities, lengths etc, and gave no formulas. When I tried to use it with what Info I had it seemed very inaccurate. It gave a velocity which was supposed to be 65% of the shots. The string deviation was always about 50ft/sec or more above and below the 65% value. I always thought published figures were about average for a string, perhaps plus or minus 25-30ft/sec.